What are Construction Loans for Custom Homes?

What Construction Finance Covers When Building Custom

Construction finance splits the loan amount across progress payments instead of handing over everything upfront. You get funds released at each stage as your registered builder hits milestones like base, frame, lockup, and practical completion. Lenders only charge interest on the amount drawn down, so you're not paying interest on the full build cost from day one.

Consider someone running fixed plant at a Pilbara lithium site who buys suitable land outright, then arranges construction funding for a $420,000 custom build. The lender approves the total loan amount based on the fixed price building contract and council plans. Money releases in instalments after a progress inspection confirms each stage is done. At base stage, they might draw $105,000. Interest accrues only on that portion until the next drawdown at frame stage.

Most lenders require you to commence building within a set period from the Disclosure Date, usually six to twelve months. If approvals drag or your builder's schedule slips, you'll need to extend that timeframe or the loan offer lapses.

How Land and Construction Packages Get Structured

A land and construction package bundles the land purchase and build cost into one approval. The lender settles the land first, then releases construction funding according to the progress payment schedule. This approach works when you've found a block and locked in a builder, but you're settling both around the same time.

Some operators prefer to buy land with cash or a separate loan, then apply for construction finance once they've finalised the custom design and received council approval. That gives more control over timing, especially if you're still offshore when the land settlement happens. Either way, you'll need a fixed price contract from a registered builder before any lender will touch the construction funding.

The development application and final council approval need to be in hand before construction drawdowns begin. Lenders won't release funds against a build that doesn't have the green light from the local authority.

What the Progressive Drawdown Actually Costs

Every time the lender releases money, they charge a Progressive Drawing Fee or progress payment fee. That's usually between $300 and $500 per drawdown, and most builds trigger five or six payments. Add it up and you're looking at $1,500 to $3,000 in fees across the build, separate from interest.

Interest-only repayment options during construction mean you're only servicing the interest on whatever's been drawn so far. Once the build reaches practical completion, the loan converts to a standard principal and interest mortgage. Some lenders offer a construction to permanent loan, which rolls straight into your home loan without a second application. Others require you to refinance or reapply once the build is done, which adds another round of paperwork and potential rate changes.

Lenders calculate serviceability on the full loan amount from the start, even though you're only drawing progressively. If your income changes between approval and final drawdown, that can create issues at the tail end of the build.

Fixed Price Contracts Versus Cost Plus Arrangements

Most lenders will only fund construction under a fixed price building contract. That's a locked-in price for the whole build, variations aside. The builder carries the risk if materials or labour costs blow out. You know exactly what the project costs before the first slab goes down, and the lender knows what they're funding.

Cost plus contracts, where you pay actual costs plus a builder's margin, don't get much love from mainstream lenders. The final loan amount is uncertain, and that makes risk assessment near impossible. If you're set on a cost plus contract or taking on owner builder finance, you'll need a specialist lender, and the construction loan interest rate will reflect that added risk.

Custom builds often involve architects, engineers, and design tweaks. Variations to the original contract are normal, but each one needs to be documented and approved by the lender before the money flows. A $15,000 variation for upgraded fixtures won't automatically get added to your drawdown unless you've cleared it first.

How the Progress Payment Schedule Aligns With Your Builder

Your builder invoices according to a progress payment schedule in the building contract. The lender's construction draw schedule needs to match those stages. If there's a mismatch between when your builder expects payment and when the lender releases funds, you'll need to cover the gap yourself or renegotiate timing.

Progress inspections happen before each drawdown. The lender sends a valuer or inspector to confirm the stage is complete and the work quality stacks up. If the inspector flags defects or incomplete work, the drawdown gets held until it's sorted. That can delay your builder's payment and create tension if they're waiting on cash to pay sub-contractors, plumbers, or electricians.

Some operators arrange a buffer in their offset account or redraw to cover timing gaps, especially if they're offshore when a drawdown is due. Lenders won't release funds without signed drawdown requests and inspection sign-off, so having someone onshore with authority to handle that paperwork keeps things moving.

What Happens When You're Offshore During Construction

Being on a two-week swing when your builder hits lockup stage means you need systems in place to approve drawdowns remotely. Most lenders accept electronic signatures for drawdown requests, but you'll need to stay on top of emails and respond within the timeframe your builder expects.

Having a home loan designed for FIFO workers means your broker understands the communication challenges when you're out of range for days at a time. They can coordinate with your builder and the lender's construction team to keep the schedule on track without requiring you to be available every single day.

If defects or variations come up while you're offshore, make sure your builder has written authority to discuss options with your broker. You don't want decisions stalled because no one can reach you for a week.

Interest Rates and How They Compare to Standard Mortgages

Construction loan interest rates sit slightly higher than standard variable home loan rates. Lenders price in the additional administration, inspections, and risk that come with progressive drawdowns. The gap is usually 0.10% to 0.30%, though it varies depending on the lender and your deposit size.

During construction, you're paying interest only on the drawn portion. That keeps repayments lower while the build is underway, but it also means you're not reducing the principal during that six to twelve month window. Once the loan converts to principal and interest after practical completion, repayments jump to reflect the full loan amount.

Some lenders let you lock in a fixed rate at the start of construction, which protects you if rates climb during the build. Others only let you fix once construction is complete. If rates are shifting, that timing can make a noticeable difference to your repayments once the loan converts.

When Council Delays Push Back Your Build Timeline

Council approval timelines vary wildly depending on the local authority and the complexity of your custom design. A straightforward single-storey design on a flat block might clear in six weeks. A split-level build with retaining walls and bushfire requirements can take four months or longer.

If your construction loan approval expires before council signs off, you'll need to reapply or request an extension. Some lenders grant extensions without reassessing your financials, others treat it like a fresh application. If your circumstances have changed, such as a shift in roster or a new car loan, that reassessment can alter your borrowing capacity or rate.

Once council approval lands, you've usually got a set window to start construction before the loan offer lapses. If your builder can't mobilise in time due to scheduling or material delays, you'll need to negotiate another extension or risk losing your rate and approval.

How Custom Home Finance Differs From House and Land Packages

A house and land package involves a volume builder and a standard floor plan. The builder has built that design dozens of times, council approval is usually quicker, and the lender has a clear view of costs and timelines. Custom home finance funds a one-off design, often with an architect and a smaller builder who might not have the same lending panel access as a national volume builder.

Lenders treat custom builds as higher risk because there's less certainty around final costs, build quality, and resale value. That means you'll often need a larger deposit, typically at least 10% to 20%, whereas some house and land deals can proceed with less. The trade-off is you get exactly what you want built exactly where you want it, rather than a cookie-cutter layout on an estate block.

If you're comparing both options, the custom build will take longer to settle and cost more in fees, but the end result fits your block and your lifestyle instead of a template.

Funding a custom build while working fly-in schedules takes planning, but the process is built around staged payments and inspections that can run without you being onshore every week. Call one of our team or book an appointment at a time that works for you, and we'll walk through how the drawdown schedule aligns with your roster and what lenders actually fund for FIFO fixed plant operators building from scratch.

Frequently Asked Questions